Magnetorheological rubber stopper with variable damping characteristic

Abstract

The invention discloses a magneto-rheological rubber stopper with a variable damping characteristic. The magneto-rheological rubber stopper comprises a top cover, a cylinder body, a first bolt, an elastic body and a damping module, the cylinder body is fixedly connected with the top cover through a first bolt; the elastomer is adhered to the cylinder body and positioned at one end of the cylinder body away from the top cover; a medium cavity is formed in the elastic body, and a magnetorheological medium is injected into the medium cavity; the damping module is arranged in the cylinder body and divides the medium cavity into two sub-cavities, and a first flow channel opening and a second flow channel opening are formed in the damping module so that the magnetorheological medium can pass through the first flow channel opening and the second flow channel opening, and the two sub-cavities can communicate with each other; the damping module comprises a magnetic part. According to the magnetorheological rubber backstop with the variable damping characteristic, the magnetorheological fluid and the rubber backstop are subjected to integrated optimization design, the rubber backstop can have the damping characteristic while achieving the hard backstop function, and therefore impact energy can be rapidly dissipated, and the service life of the rubber backstop is prolonged. And the riding comfort of passengers can be improved while the safety of the vehicle is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of vibration reduction devices, and in particular to a magnetorheological rubber stopper with variable damping characteristics. Background Art

[0002] Rubber stopper is a common rubber and metal composite vibration damping and limiting element, which is widely used in various occasions requiring vibration damping and limiting, especially in the bogies of locomotives. Among them, the most commonly used is the single stopper structure, which has some characteristics and disadvantages. The advantage is that its performance can basically meet the needs of various working conditions, but the disadvantage is that when it is necessary to show a significant damping effect during the deformation process, this structure is difficult to meet the requirements.

[0003] With the development of locomotive and vehicle technology, especially the development of high-speed vehicle technology, vehicle suspension parts need to meet the vehicle's dynamic requirements while ensuring the comfort of passengers, so the damping performance requirements of rubber stops are becoming increasingly higher. When the rubber stop is required to have damping characteristics while being able to achieve the hard stop function, a new type of structure is needed to achieve this performance requirement. Summary of the invention

[0004] The purpose of the present invention is to provide a magnetorheological rubber stopper with variable damping characteristics. The magnetorheological fluid and the rubber stopper are integrated and optimized so that the rubber stopper can realize the hard stop function while also having damping characteristics, thereby ensuring the safety of the vehicle while improving the riding comfort of the passengers.

[0005] To achieve the above-mentioned object, the present invention provides a magnetorheological rubber stopper with variable damping characteristics, comprising a top cover, a cylinder body, a first bolt, an elastic body and a damping module;

[0006] The cylinder body and the top cover are fixedly connected by the first bolt; the elastic body is adhered to the cylinder body and is located at one end of the cylinder body away from the top cover; a medium cavity is opened in the elastic body, and a magnetorheological medium is filled in the medium cavity;

[0007] The damping module is arranged in the cylinder body to divide the medium cavity into two sub-cavities. The damping module is provided with a first flow channel opening and a second flow channel opening to accommodate the magnetorheological medium to pass through so that the two sub-cavities are connected. The damping module includes a magnetic part.

[0008] Preferably, the damping module also includes a sleeve, a first cover plate, a second cover plate, an end cover and a second bolt; the sleeve is installed inside the cylinder body and is squeezed and fixed with the cylinder body and the top cover, and the first flow opening is opened on the end surface of the sleeve away from the top cover; the first cover plate is installed at the bottom of the sleeve, and the magnetic part, the second cover plate and the end cover are installed in sequence above the first cover plate, and the first cover plate, the second cover plate, the magnetic part and the end cover are all fixed in the sleeve by the second bolt, and the end surface of the end cover close to the top cover is provided with the second flow opening; there are gaps between the sleeve and the first cover plate, the second cover plate and the magnetic part, so that the first flow opening is connected with the second flow opening.

[0009] Preferably, the number of the first flow channel openings is 6 and they are evenly distributed on the end surface of the bottom of the sleeve.

[0010] Preferably, the number of the second flow channel openings is 6 and they are evenly distributed on the end surface of the end cover.

[0011] Preferably, the end surface of the elastomer close to the cylinder body is provided with a step, and the end surface of the sleeve close to the elastomer is provided with a groove, and the step on the end surface of the elastomer is in close contact with the groove on the end surface of the sleeve.

[0012] Preferably, a piston, a spring and a piston sealing ring are arranged inside the cylinder body; the piston is installed inside the cylinder body near the top cover; the spring is installed between the piston and the cylinder body, and the piston sealing ring is installed on the contact surface between the piston and the cylinder body.

[0013] Preferably, the number of the springs is 6 and they are evenly installed between the piston and the cylinder body.

[0014] Preferably, the position of the piston close to the top cover is in contact with the top cover, and a ring groove is provided at the position of the piston close to the top cover; the spring is always in a compressed state inside the piston.

[0015] Preferably, a cylinder seal is installed on the end surface of the cylinder body close to the top cover.

[0016] Preferably, the end surface of the cylinder body close to the elastic body is an inclined surface.

[0017] Therefore, the beneficial effects of the present invention using the above-mentioned magnetorheological rubber stopper with variable damping characteristics are as follows:

[0018] (1) The present invention arranges magnetorheological fluid inside the rubber stopper, and squeezes the magnetorheological fluid in the medium cavity toward the damping module by squeezing the rubber stopper, so that the rubber stopper can not only realize the hard stop function but also provide variable damping characteristics, and provide good flexible vibration reduction effect when the lateral deformation is small. As the load increases, it can provide a blocking function to ensure the safety of the vehicle and increase the comfort of the passengers.

[0019] (2) The present invention provides a piston and a spring inside the cylinder body, and the cooperation of the piston and the spring pushes back the magnetorheological fluid that has been squeezed through the damping module, so that the magnetorheological fluid returns to the medium cavity through the damping module again, thereby achieving the effect of being able to run stably for multiple times and ensuring the long-term operation stability of the rubber stopper.

[0020] (3) The present invention increases the ultimate bearing capacity of the bonding surface between the elastomer and the cylinder body by setting the contact surface between the cylinder body and the elastomer, and sets the elastomer step and the groove of the sleeve to match, thereby reducing the impact force of the magnetorheological fluid on the contact surface between the cylinder body and the elastomer during the extrusion process, so that the ultimate working condition of the rubber stopper is further enhanced.

[0021] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a 3 / 4 three-dimensional structural schematic diagram of an embodiment of a magnetorheological rubber stopper with variable damping characteristics of the present invention;

[0023] Figure 2 It is a schematic cross-sectional structure diagram of an embodiment of a magnetorheological rubber stopper with variable damping characteristics of the present invention;

[0024] Figure 3 It is a schematic diagram of the sleeve structure of an embodiment of a magnetorheological rubber stopper with variable damping characteristics of the present invention;

[0025] Figure 4 The diagram is a structural diagram of an end cover and a damping module of an embodiment of a magnetorheological rubber stopper with variable damping characteristics of the present invention.

[0026] Reference numerals

[0027] 1. Top cover; 2. First bolt; 3. Cylinder body; 4. Elastomer; 5. Sleeve; 6. First cover plate; 7. Magnetic part; 8. Medium cavity; 9. First flow channel opening; 10. Second cover plate; 11. End cover; 12. Spring; 13. Piston; 14. Piston sealing ring; 15. Cylinder body sealing member; 16. Second flow channel opening; 17. Second bolt. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0029] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] Embodiment 1

[0031] like Figure 1 As shown, the present invention provides a magnetorheological rubber stopper with variable damping characteristics, comprising a top cover 1, a cylinder body 3, a first bolt 2, an elastic body 4 and a damping module.

[0032] The cylinder body 3 and the top cover 1 are fixedly connected by the first bolt 2, the elastic body 4 is adhered to the cylinder body 3 and is located at the end of the cylinder body 3 away from the top cover 1, and a medium cavity 8 is provided in the elastic body 4, and a magnetorheological medium is filled in the medium cavity 8. The magnetorheological medium used in this embodiment is an intelligent liquid material whose damping and shear modulus are continuously controllable with the external magnetic field, so that the rubber stopper of this embodiment has the advantages of millisecond-level rapid response and high power density.

[0033] like Figure 2 As shown, the damping module is arranged in the cylinder body 3 to separate the medium chamber 8 into two sub-chambers so that the magnetorheological medium can flow in the two sub-chambers. The damping module includes a magnetic part 7, which is configured to form an adjustable geomagnetic field and a permanent magnetic field when powered on to change the characteristics of the magnetorheological medium passing through the damping module. The damping module also includes a sleeve 5, a first cover plate 6, a second cover plate 10, an end cover 11 and a second bolt 17. The sleeve 5 is installed inside the cylinder body 3 and is fixed by being squeezed between the cylinder body 3 and the top cover 1, as shown in FIG. Figure 3 As shown, a first flow channel opening 9 is opened on the end surface of the sleeve 5 away from the top cover 1 , and the number of the first flow channel openings 9 is 6 and they are evenly distributed on the end surface of the bottom of the sleeve 5 .

[0034] The sleeve 5 is fixed between the cylinder body 3 and the top cover 1 , which can ensure that the sleeve 5 does not deviate when the magnetorheological medium is squeezed toward the sleeve 5 , and further ensure that the magnetorheological medium can smoothly pass through the first flow channel opening 9 into the damping module.

[0035] The first cover plate 6 is installed at the bottom of the sleeve 5, and the magnetic part 7, the second cover plate 10 and the end cover 11 are installed above the first cover plate 9 in sequence. The first cover plate 6, the second cover plate 10, the magnetic part 7 and the end cover 11 are fixed in the sleeve 5 by the second bolt 17. Figure 4 As shown, the end surface of the end cover 11 close to the top cover 1 is provided with second flow channel openings 16 , and the number of the second flow channel openings 16 is 6 and they are evenly distributed on the end surface of the end cover 11 .

[0036] There are gaps between the sleeve 5 and the first cover plate 6, the second cover plate 10, and the magnetic part 7, so that the first flow channel opening 9 is connected to the second flow channel opening 16 to accommodate the passage of the magnetorheological medium, so that the two sub-cavities are connected. Due to the existence of the first cover plate 6, the second cover plate 10 and the magnetic part 7, a tortuous flow channel is formed inside the damping module. When the magnetorheological fluid passes through the tortuous flow channel, it needs to pass through a longer flow channel to increase the shear area, so as to achieve the purpose of generating greater damping under the same conditions.

[0037] A piston 13, a spring 12 and a piston seal 14 are arranged inside the cylinder 3. The piston 13 is installed inside the cylinder 3 near the top cover 1. The spring 12 is installed between the piston 13 and the cylinder 3. There are 6 springs 12 and they are evenly installed between the piston 13 and the cylinder 3. The piston seal 14 is installed on the contact surface between the piston 13 and the cylinder 3, and can effectively seal the piston 13.

[0038] When the elastic body 4 is squeezed, the medium cavity 8 is deformed, and then the magnetorheological medium in the medium cavity 8 is squeezed into the damping module through the first flow channel 9, and flows out of the second flow channel 16 after passing through the magnetic field generated by the magnetic part 7, so that the spring 12 can have a damping characteristic when it is squeezed. The damping module can change the magnetic field intensity formed by changing the current, thereby changing the viscosity of the magnetorheological fluid to adjust the damping force generated, so that the damping characteristics of the spring 12 itself during the squeezing process are adjustable and can be modified in real time according to specific problems.

[0039] When the magnetorheological medium flows through the damping module and flows out from the second flow channel 16, it will accumulate between the top cover 1 and the damping module, and then impact the piston 13, squeezing the piston 13 to move away from the top cover 1, and the spring 12 under the piston 13 is squeezed and deformed at the same time. When the extrusion of the elastomer 4 ends, the magnetorheological medium loses the main force that drives the magnetorheological medium to flow through the damping module to squeeze the piston 13. At this time, the spring 12 recovers and pushes the piston 13 back to the initial position, and then pushes the magnetorheological medium between the piston 13 and the top cover 1 back to the medium chamber 8, so that the rubber stopper returns to the initial state as a whole and waits for the next extrusion. The piston seal 14 is installed on the surface where the piston 13 contacts the cylinder body 3, and is squeezed between the piston 13 and the cylinder body 3 to achieve a sealing effect, ensuring that the magnetorheological medium will not pass through the gap between the piston 13 and the cylinder body 3, and ensuring that the total amount of the magnetorheological medium will not decrease, thereby achieving the effect of being able to run stably for multiple times, and ensuring the stability of the long-term operation of the rubber stopper.

[0040] The piston 13 is in contact with the top cover 1 near the top cover 1, which can limit the piston 13 and ensure that the piston 13 can only be pushed back to the initial position by the spring 12. The piston 13 is provided with an annular groove near the top cover 1 to ensure that when the piston returns to the initial limit position, the magnetorheological medium can still exert an extrusion force on the piston 13 to push the piston 13 downward. The spring 12 is always in a compressed state inside the piston 13, and can provide a certain force at the initial position of the piston 13, ensuring that the piston 13 has enough power to be pushed back to the initial position.

[0041] A cylinder seal 15 is installed on the end surface of the cylinder 3 close to the top cover 1. When the top cover 1 is tightly connected to the cylinder 3 with bolts, the cylinder seal 15 will be squeezed to achieve a sealing effect, ensuring that the magnetorheological medium will not flow out through the gap between the cylinder 3 and the top cover 1, and ensuring that the total amount of the magnetorheological medium will not decrease, thereby achieving the effect of being able to run stably for multiple times and ensuring the long-term stability of the rubber stop.

[0042] The end surface of the elastic body 4 close to the cylinder body 3 is provided with a step, and the end surface of the sleeve 5 close to the elastic body 4 is provided with a groove, and the step of the end surface of the elastic body 4 is in close contact with the groove of the end surface of the sleeve 5. After the elastic body 4 is adhered to the cylinder body 3, the set step will extend beyond the cylinder body 3, and match with the groove set on the end surface of the sleeve 5 close to the elastic body 4, and also adhere, so that it can be ensured that after being squeezed, the magnetorheological medium first impacts the sleeve 5 and the adhesion between the sleeve 5 and the elastic body 4, and will not directly impact the adhesion between the elastic body 4 and the cylinder body 3, further ensuring the adhesion effect between the elastic body 4 and the sleeve 5, and ensuring the stability of the long-term operation of the rubber stopper.

[0043] The end face of the cylinder body 3 close to the elastic body 4 is an inclined surface, so that when the elastic body 4 is deformed in the lateral direction, the adhesion surface between the elastic body 4 and the cylinder body 3 is no longer subjected to shear force in a single direction, and the force is dispersed to a certain extent, further enhancing the adhesion effect between the elastic body 4 and the surface of the cylinder body 3, and further deepening the extreme working conditions that the rubber stop can withstand.

[0044] Therefore, the present invention adopts the above-mentioned magnetorheological rubber stop with variable damping characteristics, and integrates the magnetorheological fluid and the rubber stop for optimized design, so that the rubber stop can not only realize the hard stop function but also have damping characteristics, thereby ensuring the safety of the vehicle while improving the riding comfort of the passengers.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A magnetorheological rubber stopper with variable damping characteristics, characterized in that: It includes a top cover, a cylinder body, a first bolt, an elastic body and a damping module; The cylinder body and the top cover are fixedly connected by the first bolt; the elastic body is adhered to the cylinder body and is located at one end of the cylinder body away from the top cover; a medium cavity is opened in the elastic body, and a magnetorheological medium is filled in the medium cavity; The damping module is arranged in the cylinder body to divide the medium cavity into two sub-cavities. The damping module is provided with a first flow channel opening and a second flow channel opening to accommodate the magnetorheological medium to pass through so that the two sub-cavities are connected. The damping module includes a magnetic part.

2. The magnetorheological rubber stopper with variable damping characteristics according to claim 1, characterized in that: The damping module also includes a sleeve, a first cover plate, a second cover plate, an end cover and a second bolt; the sleeve is installed inside the cylinder body and is squeezed and fixed by the cylinder body and the top cover, and the first flow channel opening is opened on the end surface of the sleeve away from the top cover; the first cover plate is installed at the bottom of the sleeve, and the magnetic part, the second cover plate and the end cover are installed above the first cover plate in sequence, and the first cover plate, the second cover plate, the magnetic part and the end cover are all fixed in the sleeve by the second bolt, and the end surface of the end cover close to the top cover is provided with the second flow channel opening; there are intervals between the sleeve and the first cover plate, the second cover plate and the magnetic part, so that the first flow channel opening is connected with the second flow channel opening.

3. The magnetorheological rubber stopper with variable damping characteristics according to claim 2, characterized in that: The number of the first flow channel openings is 6 and they are evenly distributed on the end surface of the bottom of the sleeve.

4. The magnetorheological rubber stopper with variable damping characteristics according to claim 2, characterized in that: The number of the second flow channel openings is 6 and they are evenly distributed on the end surface of the end cover.

5. The magnetorheological rubber stopper with variable damping characteristics according to claim 2, characterized in that: The end surface of the elastic body close to the cylinder body is provided with a step, and the end surface of the sleeve close to the elastic body is provided with a groove, and the step on the end surface of the elastic body and the groove on the end surface of the sleeve are in close contact.

6. The magnetorheological rubber stopper with variable damping characteristics according to claim 2, characterized in that: A piston, a spring and a piston sealing ring are arranged inside the cylinder body; the piston is installed inside the cylinder body near the top cover; the spring is installed between the piston and the cylinder body, and the piston sealing ring is installed on the contact surface between the piston and the cylinder body.

7. The magnetorheological rubber stopper with variable damping characteristics according to claim 6, characterized in that: The number of the springs is 6 and they are evenly installed between the piston and the cylinder body.

8. The magnetorheological rubber stopper with variable damping characteristics according to claim 6, characterized in that: The position of the piston close to the top cover is in contact with the top cover, and a ring groove is arranged at the position of the piston close to the top cover; the spring is always in a compressed state inside the piston.

9. The magnetorheological rubber stopper with variable damping characteristics according to claim 1, characterized in that: A cylinder seal is installed on the end surface of the cylinder body close to the top cover.

10. The magnetorheological rubber stopper with variable damping characteristics according to claim 1, characterized in that: The end surface of the cylinder body close to the elastic body is an inclined surface.

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